What happens to the person who, because of carelessness, falls into sin after baptism?

St. Peter says, [ “] For if, after they have escaped the pollutions of the world through the knowledge of the Lord and Savior Jesus Christ, they are again entangled in them and overcome, the latter end is worse for them than the beginning” (2 Pet. 2:20). This does not mean that there is no salvation for them, for repentance is the path by which one can set himself straight, even at the very last moments of his life.